Here is where I purchase mine from a couple of years ago. I heard from others that they're the same as the OEM but I'm not 100% positive. I can tell you that my mirrors are still doing well even with all the off-roading and tree scrapes.

For the pair (heated/signals), they cost $284 but if you order the right and left side separately, they'll cost you about $230 (right side is ~$100 and left side is ~$130).